Control method and device for variable-capacity compressor air conditioner and variable-capacity compressor air conditioner

The invention relates to the technical field of air conditioners, and discloses a control method for a variable-capacity compressor air conditioner, an exhaust port of a variable-capacity compressor is connected with a variable-capacity cavity of the variable-capacity compressor through an exhaust pipeline, and an electric heating device is arranged on the exhaust pipeline; the control method comprises the steps that under the condition that the variable-capacity compressor air conditioner executes a heating mode, the exhaust temperature, the exhaust pressure and the saturated steam temperature corresponding to the exhaust pressure of a variable-capacity compressor are obtained; and under the condition that the difference value between the exhaust temperature and the saturated steam temperature is smaller than the first temperature, the electric heating device is controlled to be started. According to the method, liquid accumulation of the variable volume cavity can be avoided, and noise generated by impact c